Not all radiators have taps or drain plugs. They began being deleted as methanol winter antifreeze was replaced by glycol based year-round coolant in order to discourage kerb-side mechanics from the habit of draining antifreeze at the end of winter. For a while there was hardly a drain plug anywhere but as cooling systems became more complex they began to reappear though are far from universal...
Generally the valve is at the bottom of the radiator at the far left or right side but NOT along the edge. The valve may be on the front of the radiator, but will more likely be on the side facing back toward the engine compartment. By the time you need to open it, it will be discolored, very dark, and will be hard to see. You will need to apply some leverage to get it to start turning, but only at first. Be careful - if you apply too much torque all at once and slip, whatever tool you are using can slip and puncture the radiator.
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